IT16869: SELECT ROW CHANGE TOKEN WILL RETURN WRONG RESULT WHEN USING RIDSCAN (ROW IDENTIFIER SCAN)

DB2 Version 11.1 Mod1 Fix Pack1 iFix001 for Linux, UNIX, and Windows
DB2 Version 11.1 Mod 2 Fix Pack 2 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod2 Fix Pack2 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod2 Fix Pack2 iFix002 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 3 Fix Pack 3 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix002 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod4 Fix Pack4 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 4 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 5 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 7 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• SELECT ROW CHANGE TOKEN will return wrong result when using
  RIDSCAN (Row Identifier Scan)
  
  e.g.: following sql will return wrong result when using RIDSCAN
  ( (Row Identifier Scan)
  
  
  => db2 "select row change token for  bas.QUEUEINFO_20160723 FROM
  bas.QUEUEINFO_20160723 where id < 4467"
  
  1
  --------------------
                     0
                     0
                     0
                     0
                     0
                     0
                     0
                     0
                     0
                     0
  
  ...
                     0
                     0
  
    140 record(s) selected.
  
  Access Plan like following:
  -----------
          Total Cost:             36.5867
          Query Degree:           1
  
                 Rows
                RETURN
                (   1)
                 Cost
                  I/O
                  |
                140.456
                FETCH
                (   2)
                36.5629
                  33
             /----+-----\
         140.456         4922
         RIDSCN     TABLE: BAS
         (   3)   QUEUEINFO_20160723
         6.9544           Q1
            1
           |
         140.456
         SORT
         (   4)
         6.95392
            1
           |
         140.456
         IXSCAN
         (   5)
         6.91635
            1
           |
          4922
     INDEX: SYSIBM
   SQL160808050052790
           Q1
  

Local fix

• Use an optimizer guideline to choose a different access, like
  IXSCAN:
  <IXSCAN TABLE='tablename_in_query'/>
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ALL                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Please, see error description and install this Fix.          *
  ****************************************************************
  

Problem conclusion

• Please, see error description and install this Fix.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IT16693

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RB10 PSY

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